Hydraulic motor and pump



July 23, 1935. H. THoMA HYDRAULIC MOTOR AND PUMP Filed March 17, 1935Patented July '23, 1935 UNITED STATES PATENT OFFICE Application Maman,193s, serial No. 661,358

, In Germany March 30,1932

4 claims. (C1. 10s- 162) a bell-shaped element the rim of the bellserving for carrying the journals through which. the oil feed is mostlyeffected. vThe closed, bell-shaped construction has been preferably'employed in thenecessary nor practical.

It is correct, -to make the journals and their bearings rigid. However,for this purpose it is sufficient to correspondingly reinforce theconnections arranged directly be-l v tween the journals and the valveface, which connections are mostly made hollow for feeding Ithe oil.Ihese parts alone ensure an absorption of the principal piston forcesalmost without sagging, whereas the usual lateral walls of the bell,

owing to their curved shape impart only an ap-l -parent but in realityimmaterial rigidity.

According to the invention, an open oscillatably mounted frame orU-shaped yoke is therefore employed, which presents the great advantagethat the oil running off the valve face in lservice is easily visible,so that whether, for example, the control gear.

An embodiment of by Way of example in in which:

' Fig. 1 shows in side it is possible to ascertain too much oil flowsthrough the invention is yillustrated the accompanying drawing elevationa hydraulic motor or pump illustrating the present invention.

Fig. 2 is a partial lo ngitudinal section of Fig. 1.

Fig. 3 is a partial section of the device showing the valve face.

A shaft W is guided 4in suitable radial and axial bearings and carriesthe driving flange T. Connecting rods P Vprovided with the usual ballsare hinged to this driving flange T. The connecting rods P serve fordriving the pistons' not shown in the drawing located ina rotarycylinder block Z.

The. cylinder block Z carries a' valve surface S,

with the valve face.

The important feature is,

the arrangement of a frame or yoke R which is for the greater part openand which presents-a clear view of the important parts of thecooperating cylinder and valve surface especially the oil flow from thevalve face. The parts of the frame R may at the same time be made hollowfor the oil feed and discharge. The parts of the frame R may be cast in-one-piece with the valve body or bolted thereon. In the case of largesize constructions and high oil pressures which act on the pivotl pinsZ, an undesirable resilient yielding of the frame R might however occur.In order tol prevent this, staybolts'B or other supportingelementspressed or cast in a suitable mannerbetween the arms may beemployed which however should be so constructed as to leave between theA `valve face S and the supporting elements an ample window aperturethrough which the working of the control gear or the quantity of oilrunning off can be observed. 20 The essential feature is the arrangementof an open frame element or yoke for hydraulic motors or pumps withoscillatably mounted cylinders in such a manner that the operation ofthe valve surfaces and the quantity of oil flowing off therefrom can beobserved. The staybolts B may at the same time serve as connectingvmeans for a driving member for the adjusting mechanism, for example fora screw spindle Sch which is hingedly connected on one side of theframe. On the other staybolt for example intermediate springs,indicating devices or the like can act. The screw spindle and the otherparts can be keyed as required on the upwardly or downwardly extendedbolt B, or, if a cast or otherwise inserted constructional element isemployed instead of the bolt B,

.provided with a bearing surface havingv valve ports therein and withspaced generally parallel arms attached to said base on opposite sidesthereof and extending from said base toward said support, each of whicharms is formed with a passageway communicating with one of said valveports, a rotatable cylinder member having cooperating ports thereinconnected for rotation with said shaft, bearing against said surfacewith its ports communicating alternately with the ports in said bearingsurface, said bearing surface being located between the arms, and thespace between said arms adjacent said bearing surface being left open toprovide access to said bearing surface from the side and to permitobservation of the operation of said rotatable cylinder member inrelation to said bearing surface.

2. In a hydraulic motor or pump,.the combination comprising a rotatableshaft, a bearing for said shaft, a cylinder support member pivotallyconnected to a support, said pivoted member being provided`with a baseformed with a surface having valve ports therein and with spacedgenerally parallel arms attached to said base on opposite sides thereofand extending from said base toward said support, said cylinder supportmember being formed with passageways communicating with said valveports, a. rotatable cylinder member having cooperating parte thereincorinected for rotation with said shaft, bearing against said surfacewith its ports communicating alternately wtih the ports in said bearingsurface, said bearing surface being located between the arms and thespace between said arms and adjacent said bearing surface being leftopen to provide access to said bearing surface from the side and topermit observation ci" the operation of said rotatable cylinder memberin relation to said bearing surface.

3. In a hydraulic motor or pump, the combination comprising a rotatableshaft, a bearing for said shaft, a cylinder support member pivotailyconnected to a support, said pivoted member be ing provided with a baseformed with a surface having valve ports therein and with spacedgenerally parallel arms attached to said base on opposite sides thereofand extending from said base toward said support, said cylinder supportmember being formed with passageways communicating with said valveports, a rotatable cylinderv member having cooperating portsthereinvconnected for rotation with said shaft located adjacent saidvalve surface with its ports communieating alternately with the ports insaid valve surface, said valve surface being located between the armsand the space between said arms and' adjacent 'said valve surface beingleft open to provide access to said surface from the side and to permitobservation of the-operation of said rotatable cylinder member inrelation to said valve surface.

4. In a hydraulic motor or pump, the combinationcomprising arotatable'shaft, a bearing for said shaft, a cylinder-support memberpivotally connected to a support,'said pivoted member being providedwith a base formed with a surface having valve ports therein and Withspa-ced generally parallel arms attached to said base on opposite sidesthereof and extending from said base tcward said support, said cylindersupport being formed with passageways communicating with said valveports, a rotatable cylinder member having cooperating ports .thereinconnected for rotation with said shaft located adjacent said valvesurface with its ports communicating alternately with the ports in saidvalve surface, said 4valve surface being located between the arms andthe space between said arms and adjacent said valve surface being leftopen to provide acc'ess to said surface fram the side and topermitobservation of the operation of said rotatable cylinder member inrelation to said valve surface, said spaced arms being provided withtransverse connecting means adjacent theirpivoted en ds.

v HANS THOMA.

